From 6fc5fdbdc70dd17ea8e681a361fb4dae541ee953 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Fri, 4 Mar 2011 00:45:59 -0500 Subject: implement POSIX semaphores --- src/thread/sem_timedwait.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 src/thread/sem_timedwait.c (limited to 'src/thread/sem_timedwait.c') diff --git a/src/thread/sem_timedwait.c b/src/thread/sem_timedwait.c new file mode 100644 index 00000000..e6604364 --- /dev/null +++ b/src/thread/sem_timedwait.c @@ -0,0 +1,18 @@ +#include +#include "pthread_impl.h" + +int sem_timedwait(sem_t *sem, const struct timespec *at) +{ + int val; + + for (;;) { + if (a_fetch_add(sem->__val, -1) > 0) return 0; + val = a_fetch_add(sem->__val, 1); + CANCELPT_BEGIN; + if (val <= 0 && __timedwait(sem->__val, val, CLOCK_REALTIME, at, 0) == ETIMEDOUT) { + errno = ETIMEDOUT; + return -1; + } + CANCELPT_END; + } +} -- cgit v1.2.1